[dns-operations] bind + client-subnet

[Ken Peng]

On 2013-8-13 18:30, Jared Mauch wrote:
> I'm not sure how accurate this really is, but:
>
> http://www.cdnplanet.com/blog/which-cdns-support-edns-client-subnet/
>
> Basically, it helps pass the client IP upstream so the CDN can make a better guess to which cluster to direct you to, instead of the query-source IP of the recursive they are talking to.

but how to implement that? since local DNS server always has caching.